Automatic acid pressing device for acid collecting tank of VCM device

Abstract

The utility model relates to the technical field of chemical production, in particular to an automatic acid pressing device for an acid collecting tank of a VCM (Vinyl Chloride Monomer) device, and aims to solve the problems that in the acid discharging process of an acid discharging port of an acid collecting tank at present, due to the fact that a manual acid discharging mode is generally adopted, the acid discharging operation wastes time and labor, an acid discharging hand valve is not opened in time after acid pressing, and potential production safety hazards are caused. According to the device, an acid collecting tank, an acid discharging hand valve, an acid discharging self-control valve, a nitrogen charging self-control valve, a gas phase balance pipeline regulating valve, an acid collecting tank acid discharging self-control valve and other matched acid discharging control devices are additionally arranged in the acid discharging process, so that the automation degree of an acid discharging opening of the acid collecting tank in the acid discharging process is further improved, and automatic acid pressing of the acid collecting tank is achieved; therefore, the problem of manual operation of acid discharge in field production is solved, the labor intensity of operators is reduced, meanwhile, the misoperation that the acid discharging hand valve is not opened in time after acid pressing during original manual operation is effectively avoided, and then the potential safety hazard of acid pressing production is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to an automatic acid pressing device for an acid collecting tank of a VCM device. Background Art

[0002] During the PVC chemical production process, the VCM unit's mixed dehydration system uses cryogenic cooling, demisting elements, and falling film absorption to remove excess HCl from the system. This prevents residual HCl in the crude vinyl chloride gas from reacting with water to form hydrochloric acid, which could corrode the interior of subsequent equipment and gas transmission pipelines. Therefore, all equipment in the mixed dehydration system is designed with an acid discharge port to visualize the acid discharge status of the equipment during operation, facilitating inspection of normal equipment operation. Excess hydrochloric acid is collected in the acid discharge port and ultimately transferred to an acid collection tank. Once the liquid level reaches the set value, it can be transported to the by-product hydrochloric acid tank for use in other ancillary processes in the system. In the conventional acid discharge process, the acid discharge manual valve is always open, the acid discharge automatic control valve and the gas phase balance pipeline regulating valve are open, the nitrogen filling automatic control valve and the acid collecting tank acid discharge automatic control valve are closed, and the mixed dehydration equipment is in operation to dehydrate and discharge the acid at the same time, and all the acid is collected in the acid collecting tank. In the dehydration and acid discharge process, due to the manual operation of on-site production acid discharge, the labor intensity of the operators is easily increased, and the erroneous operation of not opening the acid discharge manual valve in time after the acid is pressed occurs, which in turn causes a major production safety hazard. Utility Model Content

[0003] The utility model provides an automatic acid pressing device for an acid collecting tank of a VCM device, so as to solve the problems existing in the above background.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The invention discloses an automatic acid compression device for an acid collecting tank of a VCM device, comprising a mixer, wherein the mixer is connected to a hydrogen chloride cooler, which is connected to a hydrogen chloride demister, and outlets of the hydrogen chloride cooler and the hydrogen chloride demister are both connected to the acid collecting tank. The mixer is also connected to a mixer cooler, which is connected to a primary hydrochloric acid mist filter, which is connected to a secondary hydrochloric acid mist filter, which is connected to a mixed gas preheater, and the secondary hydrochloric acid mist filter, the mixer cooler, the primary hydrochloric acid mist filter and the mixer are all connected to the acid collecting tank.

[0006] Furthermore, the hydrogen chloride cooler, hydrogen chloride demister, mixer cooler, primary hydrochloric acid mist filter, secondary hydrochloric acid mist filter and the pipeline between the mixer and the acid collecting tank are sequentially provided with an acid discharge manual valve and a first acid discharge automatic control valve.

[0007] Furthermore, the side of the acid collecting tank is connected to a nitrogen charging pipe, which is provided with a nitrogen charging automatic control valve. The top outlet of the acid collecting tank is connected to a gas phase balance pipe, which is provided with a gas phase balance pipe regulating valve. The bottom of the acid collecting tank is connected to a by-product hydrochloric acid tank, and the pipeline connecting the acid collecting tank to the by-product hydrochloric acid tank is provided with an acid discharge manual valve and a second acid discharge automatic control valve in sequence.

[0008] The utility model has the following beneficial effects:

[0009] The utility model provides an automatic acid pressing device for an acid collecting tank of a VCM device. By adding an acid collecting tank, an acid discharge manual valve, an acid discharge automatic control valve, a nitrogen filling automatic control valve, a gas phase balance pipeline regulating valve and an acid collecting tank acid discharge automatic control valve and other matching acid discharge control devices during the acid discharge process, the degree of automation of the acid outlet of the acid collecting tank in the acid discharge process is further improved, and automatic acid pressing of the acid collecting tank is realized, thereby solving the manual operation of acid discharge in on-site production and reducing the labor intensity of operators. At the same time, it effectively avoids the erroneous operation of the acid discharge manual valve not opening in time after acid pressing in the original manual operation, thereby greatly reducing the safety hazards of acid pressing production, and solving the problems of time-consuming and labor-intensive acid discharge operation and production safety hazards caused by the widespread use of manual acid discharge in the acid discharge process of the acid collecting tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0011] The meanings of the reference numerals are as follows:

[0012] 1. Mixer; 2. Hydrogen chloride cooler; 3. Hydrogen chloride demister; 4. Mixer cooler; 5. Primary hydrochloric acid mist filter; 6. Secondary hydrochloric acid mist filter; 7. Mixed gas preheater; 8. Acid collecting tank; 9. Acid discharge manual valve; 10. First acid discharge automatic control valve; 11. Nitrogen charging automatic control valve; 12. Gas phase balancing pipe regulating valve; 13. Second acid discharge automatic control valve; 14. By-product hydrochloric acid tank; 15. Nitrogen charging pipe; 16. Gas phase balancing pipe; 17. Converter; 18. Hydrogen chloride gas; 19. Acetylene gas. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0014] like Figure 1As shown, an automatic acid pressure device for an acid collecting tank of a VCM device includes a mixer 1, the mixer 1 is connected to a hydrogen chloride cooler 2, the hydrogen chloride cooler 2 is connected to a hydrogen chloride demister 3, the outlets of the hydrogen chloride cooler 2 and the hydrogen chloride demister 3 are both connected to an acid collecting tank 8, the mixer 1 is also connected to a mixer cooler 4, the mixer cooler 4 is connected to a primary hydrochloric acid mist filter 5, the primary hydrochloric acid mist filter 5 is connected to a secondary hydrochloric acid mist filter 6, the secondary hydrochloric acid mist filter 6 is connected to a mixed gas preheater 7, and the secondary hydrochloric acid mist filter 6, the mixer cooler 4, the primary hydrochloric acid mist filter 5 and the mixer 1 are all connected to the acid collecting tank 8.

[0015] The hydrogen chloride cooler 2, the hydrogen chloride demister 3, the mixer cooler 4, the primary hydrochloric acid mist filter 5, the secondary hydrochloric acid mist filter 6 and the pipeline between the mixer 1 and the acid collecting tank 8 are sequentially provided with an acid discharge manual valve 9 and a first acid discharge automatic control valve 10.

[0016] The side of the acid collecting tank 8 is connected to a nitrogen charging pipe 15, and a nitrogen charging automatic control valve 11 is provided on the nitrogen charging pipe 15. The top outlet of the acid collecting tank 8 is connected to a gas phase balance pipe 16, and a gas phase balance pipe regulating valve 12 is provided on the gas phase balance pipe 16. The bottom of the acid collecting tank 8 is connected to a by-product hydrochloric acid tank 14, and the pipeline connecting the acid collecting tank 8 to the by-product hydrochloric acid tank 14 is provided with an acid discharge manual valve 9 and a second acid discharge automatic control valve 13 in sequence.

[0017] When the liquid level of the acid collecting tank 8 reaches the set value of acid pressure, the liquid level interlock signal is transmitted to the first acid discharge automatic control valve 10, and the first acid discharge automatic control valve 10 is closed. At the same time, the gas phase balance pipe regulating valve 12 is closed, and the nitrogen charging automatic control valve 11 and the second acid discharge automatic control valve 13 are opened, so that the pressure of the acid collecting tank 8 is increased, and the acid in the acid collecting tank 8 is transported to the by-product hydrochloric acid tank 14 by nitrogen. When the acid collecting tank 8 reaches a low liquid level, the liquid level interlock signal is transmitted again, so that the first acid discharge automatic control valve 10 and the gas phase balance pipe regulating valve 12 are opened, and the nitrogen charging automatic control valve 11 and the second acid discharge automatic control valve 13 are closed, thereby restoring the normal acid collection process, thereby effectively realizing the automatic acid pressure of the acid collecting tank 8, solving the manual operation of acid discharge in on-site production, reducing the labor intensity of operators, and effectively avoiding the erroneous operation of the acid discharge manual valve not being opened in time after acid pressure during the original manual operation, thereby greatly reducing the safety hazards of acid pressure production. Therefore, the device has good practicality.

Claims

1. An automatic acid pressing device for an acid collecting tank of a VCM device, comprising a mixer (1), characterized in that: The mixer (1) is connected to a hydrogen chloride cooler (2), the hydrogen chloride cooler (2) is connected to a hydrogen chloride demister (3), the outlets of the hydrogen chloride cooler (2) and the hydrogen chloride demister (3) are both connected to an acid collecting tank (8), the mixer (1) is further connected to a mixer cooler (4), the mixer cooler (4) is connected to a primary hydrochloric acid mist filter (5), the primary hydrochloric acid mist filter (5) is connected to a secondary hydrochloric acid mist filter (6), the secondary hydrochloric acid mist filter (6) is connected to a mixed gas preheater (7), and the secondary hydrochloric acid mist filter (6), the mixer cooler (4), the primary hydrochloric acid mist filter (5) and the mixer (1) are all connected to the acid collecting tank (8).

2. The automatic acid pressure device for the acid collecting tank of a VCM device according to claim 1, characterized in that: The hydrogen chloride cooler (2), the hydrogen chloride demister (3), the mixer cooler (4), the primary hydrochloric acid mist filter (5), the secondary hydrochloric acid mist filter (6), and the pipeline between the mixer (1) and the acid collecting tank (8) are all provided with an acid discharge manual valve (9) and a first acid discharge automatic control valve (10) in sequence.

3. The automatic acid pressure device for the acid collecting tank of a VCM device according to claim 2, characterized in that: The side of the acid collecting tank (8) is connected to a nitrogen charging pipe (15), and a nitrogen charging automatic control valve (11) is provided on the nitrogen charging pipe (15). The top outlet of the acid collecting tank (8) is connected to a gas phase balance pipe (16), and a gas phase balance pipe regulating valve (12) is provided on the gas phase balance pipe (16). The bottom of the acid collecting tank (8) is connected to a by-product hydrochloric acid tank (14), and an acid discharge manual valve (9) and a second acid discharge automatic control valve (13) are sequentially provided on the pipeline connecting the acid collecting tank (8) to the by-product hydrochloric acid tank (14).

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